the reason is that born 2 reign was probally in its last days of production when 9/11 happened, adn it will take time to write the song, recurit mjb, record the song, and put it on the album. 4 years isn't really that long when you think about it.
Paul McCartney managed to get "Freedom" on his "Driving Rain" album, and that was released on November 13, 2001.
So yawn to your explaination.